I just have a preference to everthing running off 12v. I realize if you change batteries once a year all is fine. The add-on fan switch also is just not my style. BTW the Dometic has an automatic fan speed setting. Nothing wrong with the lower cost thermostat. It may even have more features like programability to set back temps based on time.
I did have a delay on the blower fan start to let the compressor start by itself on a marginal generator. That feature is now gone but I have found I really will not be using a generator to run the air for extended periods. At that point we are looking for hookups.
The price did not bother me a bit. Same as if the fridge control board went out I would not opt for a lower priced board if it relied on batteries. Reminds me it is time to change batteries in the smoke detector and CO detector :R Why can't those be 12v connected?
I also found the existing freeze sensor in a bad spot. The new sensor seems better IMO and I have had an issue a few times.
Anyway it is just another option if considering a change.